When native path-based authorization is on, mod_dav_svn does
authorization checks by itself, from the hook functions to mod_dav.
This allows for mod_dav_svn to first perform sanity checks and discard
bogus and erronous requests based on that. Most importantly native
path-based authorization in mod_dav_svn allows for cheap recursive
authorization lookups which is much faster than the Apache
sub-requests that need to be used when the authorization is handles by
mod_authz_svn.

The implementation is by no means complete. Summer of code mid-term
surveys are coming around and I need to show the code.